<template>
    <div class="star" :class="starType">
      <span v-for="(itemClass,index) in itemClasses"
            :class="itemClass"
            class="star-item"
            :key="index"
      ></span>
    </div>
</template>

<script>
const LENGTH = 5
const CLS_ON = 'on'
const CLS_HALF = 'half'
const CLS_OFF = 'off'
export default {
  name: 'Star',
  props: {
    size: Number,
    score: Number
  },
  computed: {
    starType () {
      return 'star-' + this.size
    },
    itemClasses () {
      let result = []
      let score = Math.floor(this.score * 2) / 2
      let hasDecimal = score % 1 !== 0
      let integer = Math.floor(score)
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON)
      }
      if (hasDecimal) {
        result.push(CLS_HALF)
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF)
      }
      return result
    }
  }
}
</script>

<style lang="stylus" scoped>
  .star
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        margin-right 22px
        width 20px
        height 20px
        background-size 100%
        &:last-child
          margin-right 0
        &.on
          background url("../../../resource/img/star48_on@2x.png") no-repeat
          width 20px
          height 20px
          background-size 100%
        &.half
          background url("../../../resource/img/star48_half@2x.png") no-repeat
          width 20px
          height 20px
          background-size 100%
        &.off
          background url("../../../resource/img/star48_off@2x.png") no-repeat
          width 20px
          height 20px
          background-size 100%
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 100%
        &:last-child
          margin-right 0
        &.on
          background url("../../../resource/img/star36_on@2x.png") no-repeat
          width 15px
          height 15px
          background-size 100%
        &.half
          background url("../../../resource/img/star36_half@2x.png") no-repeat
          width 15px
          height 15px
          background-size 100%
        &.off
          background url("../../../resource/img/star36_off@2x.png") no-repeat
          width 15px
          height 15px
          background-size 100%
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 100%
        &:last-child
          margin-right 0
        &.on
          background url("../../../resource/img/star24_on@2x.png") no-repeat
          width 10px
          height 10px
          background-size 100%
        &.half
          background url("../../../resource/img/star24_half@2x.png") no-repeat
          width 10px
          height 10px
          background-size 100%
        &.off
          background url("../../../resource/img/star24_off@2x.png") no-repeat
          width 10px
          height 10px
          background-size 100%

</style>
